Backing up from memory card to portable HDD

I understand the thought process, it's just that there's no reason a SSD image bank would be any less susceptible to corruption than the original cards.
As to losing cards, the answer is simple: don't lose your cards...

Well I've just got back from my extended trip - three weeks around Japan and I eventually did what Arkady suggested - I bought loads of cards, took two bodies with two card slots in each and had no problems at all.Now I've got loads of cards!

Well I've just got back from my extended trip - three weeks around Japan and I eventually did what Arkady suggested - I bought loads of cards, took two bodies with two card slots in each and had no problems at all. Now I've got loads of cards! Thanks for all your help and advice. Dave

I'm in the same boat now... It was Prime Day on Amazon recently, so I now have an estimated 12,000 raw image capacity in my camera bag at all times... More than enough for a decent holiday or as I did recently a week-long photo tour: 7 model shoots in 8 days...